Has anyone received an Internal Server Error when they get directed back from PayPal? The registration goes through fine, emails are sent etc. They just don't get the final confirmation screen. I am running DT Register 2.59.
You have something not configured correctly... Check the following:
1) IPN is enabled in the paypal account
2) Auto-return is turned OFF in the paypal account
3) /com_dtregister directory is 755 permission with files inside set to 644. Also, directories above /com_dtregister should be 755.